/*      $OpenBSD: rpc_util.c,v 1.17 2015/08/20 22:32:41 deraadt Exp $   */
/*      $NetBSD: rpc_util.c,v 1.6 1995/08/29 23:05:57 cgd Exp $ */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * rpc_util.c, Utility routines for the RPC protocol compiler
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "rpc_scan.h"
#include "rpc_parse.h"
#include "rpc_util.h"

#define ARGEXT "argument"

static void printwhere(void);

char curline[MAXLINESIZE];      /* current read line */
char *where = curline;          /* current point in line */
int linenum = 0;                /* current line number */

char *infilename;               /* input filename */

#define NFILES 7
char *outfiles[NFILES];         /* output file names */
int nfiles;

FILE *fout;                     /* file pointer of current output */
FILE *fin;                      /* file pointer of current input */

list *defined;                  /* list of defined things */

/*
 * Reinitialize the world
 */
void
reinitialize()
{
        memset(curline, 0, MAXLINESIZE);
        where = curline;
        linenum = 0;
        defined = NULL;
}

/*
 * string equality
 */
int
streq(a, b)
        char *a;
        char *b;
{
        return (strcmp(a, b) == 0);
}

/*
 * find a value in a list
 */
definition *
findval(lst, val, cmp)
        list *lst;
        char *val;
        int (*cmp) (definition *, char *);
{

        for (; lst != NULL; lst = lst->next) {
                if ((*cmp) (lst->val, val)) {
                        return (lst->val);
                }
        }
        return (NULL);
}

/*
 * store a value in a list
 */
void
storeval(lstp, val)
        list **lstp;
        definition *val;
{
        list **l;
        list *lst;

        for (l = lstp; *l != NULL; l = (list **) & (*l)->next)
                ;
        lst = malloc(sizeof(list));
        if (lst == NULL) {
                fprintf(stderr, "failed in alloc\n");
                exit(1);
        }
        lst->val = val;
        lst->next = NULL;
        *l = lst;
}

static int
findit(definition *def, char *type)
{
        return (streq(def->def_name, type));
}

static char *
fixit(char *type, char *orig)
{
        definition *def;

        def = (definition *) FINDVAL(defined, type, findit);
        if (def == NULL || def->def_kind != DEF_TYPEDEF) {
                return (orig);
        }
        switch (def->def.ty.rel) {
        case REL_VECTOR:
                return (def->def.ty.old_type);
        case REL_ALIAS:
                return (fixit(def->def.ty.old_type, orig));
        default:
                return (orig);
        }
}

char *
fixtype(type)
        char *type;
{
        return (fixit(type, type));
}

char *
stringfix(type)
        char *type;
{
        if (streq(type, "string")) {
                return ("wrapstring");
        } else {
                return (type);
        }
}

void
ptype(prefix, type, follow)
        char *prefix;
        char *type;
        int follow;
{
        if (prefix != NULL) {
                if (streq(prefix, "enum")) {
                        fprintf(fout, "enum ");
                } else {
                        fprintf(fout, "struct ");
                }
        }
        if (streq(type, "bool")) {
                fprintf(fout, "bool_t ");
        } else if (streq(type, "string")) {
                fprintf(fout, "char *");
        } else {
                fprintf(fout, "%s ", follow ? fixtype(type) : type);
        }
}

static int
typedefed(definition *def, char *type)
{
        if (def->def_kind != DEF_TYPEDEF || def->def.ty.old_prefix != NULL)
                return (0);
        else
                return (streq(def->def_name, type));
}

int
isvectordef(type, rel)
        char *type;
        relation rel;
{
        definition *def;

        for (;;) {
                switch (rel) {
                case REL_VECTOR:
                        return (!streq(type, "string"));
                case REL_ARRAY:
                        return (0);
                case REL_POINTER:
                        return (0);
                case REL_ALIAS:
                        def = (definition *) FINDVAL(defined, type, typedefed);
                        if (def == NULL)
                                return (0);
                        type = def->def.ty.old_type;
                        rel = def->def.ty.rel;
                }
        }
}

char *
locase(str)
        char *str;
{
        char c;
        static char buf[100];
        char *p = buf;

        while ((c = *str++))
                *p++ = (c >= 'A' && c <= 'Z') ? (c - 'A' + 'a') : c;
        *p = 0;
        return (buf);
}

void
pvname_svc(pname, vnum)
        char *pname;
        char *vnum;
{
        fprintf(fout, "%s_%s_svc", locase(pname), vnum);
}

void
pvname(pname, vnum)
        char *pname;
        char *vnum;
{
        fprintf(fout, "%s_%s", locase(pname), vnum);
}

/*
 * print a useful (?) error message, and then die
 */
void
error(msg)
        char *msg;
{
        printwhere();
        fprintf(stderr, "%s, line %d: ", infilename, linenum);
        fprintf(stderr, "%s\n", msg);
        crash();
}

/*
 * Something went wrong, unlink any files that we may have created and then
 * die.
 */
void
crash()
{
        int i;

        for (i = 0; i < nfiles; i++) {
                (void) unlink(outfiles[i]);
        }
        exit(1);
}

void
record_open(file)
        char *file;
{
        if (nfiles < NFILES) {
                outfiles[nfiles++] = file;
        } else {
                fprintf(stderr, "too many files!\n");
                crash();
        }
}

static char expectbuf[100];
static char *toktostr(tok_kind);

/*
 * error, token encountered was not the expected one
 */
void
expected1(exp1)
        tok_kind exp1;
{
        snprintf(expectbuf, sizeof expectbuf, "expected '%s'",
            toktostr(exp1));
        error(expectbuf);
}

/*
 * error, token encountered was not one of two expected ones
 */
void
expected2(exp1, exp2)
        tok_kind exp1, exp2;
{
        snprintf(expectbuf, sizeof expectbuf, "expected '%s' or '%s'",
            toktostr(exp1), toktostr(exp2));
        error(expectbuf);
}

/*
 * error, token encountered was not one of 3 expected ones
 */
void
expected3(exp1, exp2, exp3)
        tok_kind exp1, exp2, exp3;
{
        snprintf(expectbuf, sizeof expectbuf, "expected '%s', '%s' or '%s'",
            toktostr(exp1), toktostr(exp2), toktostr(exp3));
        error(expectbuf);
}

void
tabify(f, tab)
        FILE *f;
        int tab;
{
        while (tab--) {
                (void) fputc('\t', f);
        }
}

static token tokstrings[] = {
        {TOK_IDENT, "identifier"},
        {TOK_CONST, "const"},
        {TOK_RPAREN, ")"},
        {TOK_LPAREN, "("},
        {TOK_RBRACE, "}"},
        {TOK_LBRACE, "{"},
        {TOK_LBRACKET, "["},
        {TOK_RBRACKET, "]"},
        {TOK_STAR, "*"},
        {TOK_COMMA, ","},
        {TOK_EQUAL, "="},
        {TOK_COLON, ":"},
        {TOK_SEMICOLON, ";"},
        {TOK_UNION, "union"},
        {TOK_STRUCT, "struct"},
        {TOK_SWITCH, "switch"},
        {TOK_CASE, "case"},
        {TOK_DEFAULT, "default"},
        {TOK_ENUM, "enum"},
        {TOK_TYPEDEF, "typedef"},
        {TOK_INT, "int"},
        {TOK_SHORT, "short"},
        {TOK_LONG, "long"},
        {TOK_UNSIGNED, "unsigned"},
        {TOK_DOUBLE, "double"},
        {TOK_FLOAT, "float"},
        {TOK_CHAR, "char"},
        {TOK_STRING, "string"},
        {TOK_OPAQUE, "opaque"},
        {TOK_BOOL, "bool"},
        {TOK_VOID, "void"},
        {TOK_PROGRAM, "program"},
        {TOK_VERSION, "version"},
        {TOK_EOF, "??????"}
};

static char *
toktostr(tok_kind kind)
{
        token *sp;

        for (sp = tokstrings; sp->kind != TOK_EOF && sp->kind != kind; sp++)
                ;
        return (sp->str);
}

static void
printbuf(void)
{
        char c;
        int i;
        int cnt;

#       define TABSIZE 4

        for (i = 0; (c = curline[i]); i++) {
                if (c == '\t') {
                        cnt = 8 - (i % TABSIZE);
                        c = ' ';
                } else {
                        cnt = 1;
                }
                while (cnt--) {
                        (void) fputc(c, stderr);
                }
        }
}

static void
printwhere()
{
        int i;
        char c;
        int cnt;

        printbuf();
        for (i = 0; i < where - curline; i++) {
                c = curline[i];
                if (c == '\t') {
                        cnt = 8 - (i % TABSIZE);
                } else {
                        cnt = 1;
                }
                while (cnt--) {
                        (void) fputc('^', stderr);
                }
        }
        (void) fputc('\n', stderr);
}

char *
make_argname(pname, vname)
        char *pname;
        char *vname;
{
        char *name;
        int len = strlen(pname) + strlen(vname) + strlen(ARGEXT) + 3;

        name = malloc(len);
        if (!name) {
                fprintf(stderr, "failed in malloc\n");
                exit(1);
        }
        snprintf(name, len, "%s_%s_%s", locase(pname), vname, ARGEXT);
        return(name);
}

bas_type *typ_list_h;
bas_type *typ_list_t;

void
add_type(len, type)
        int len;
        char *type;
{
        bas_type *ptr;

        if ((ptr = malloc(sizeof(bas_type))) == (bas_type *)NULL) {
                fprintf(stderr, "failed in malloc\n");
                exit(1);
        }

        ptr->name = type;
        ptr->length = len;
        ptr->next = NULL;
        if (typ_list_t == NULL) {
                typ_list_t = ptr;
                typ_list_h = ptr;
        } else {
                typ_list_t->next = ptr;
                typ_list_t = ptr;
        }
}

bas_type *
find_type(type)
        char *type;
{
        bas_type * ptr;

        ptr = typ_list_h;

        while (ptr != NULL) {
                if (strcmp(ptr->name, type) == 0)
                        return(ptr);
                else
                        ptr = ptr->next;
        }
        return(NULL);
}